Roslyn, WA Weather - Forecast & Monthly Averages

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TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.

Weather Quick Facts

The highest monthly average temperature in Roslyn for August is 57.9 degrees
The lowest monthly average temperature in Roslyn for December is 26.3 degrees
The most monthly precipitation in Roslyn occurs in November with 14.5 inches
The air quality index in Roslyn is 45% better than the national average
The pollution index in Roslyn is 84% better than the national average

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Roslyn Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	23°F	33°F	27°F	12.2"
February	26°F	35°F	30°F	7.2"
March	29°F	39°F	33°F	11.1"
April	32°F	46°F	37°F	6.3"
May	39°F	55°F	45°F	5.8"
June	43°F	60°F	49°F	4.4"
July	49°F	70°F	57°F	1.2"
August	51°F	70°F	58°F	1.5"
September	46°F	63°F	52°F	4.1"
October	38°F	50°F	42°F	9.1"
November	30°F	37°F	33°F	14.5"
December	23°F	31°F	26°F	12.2"

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Roslyn air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
Index	Roslyn	Washington	National
Air quality index	23	36	42
Pollution index	422,626	4,541,850	2,726,193

Roslyn air quality

Measurement	Total
Days measured	365
Days with good air quality	305
Days with moderate air quality	60
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.000%
Benzene	0.010%
Carbon Tetrachloride	0.001%
Lead	0.000%
Mercury	0.000%

Average monthly Roslyn temperature with heat index

Roslyn monthly precipitation with daily maximum

Roslyn monthly snow depth with daily maximum

Roslyn monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Ronald, WA	207	23	54.0%
South Cle Elum, WA	818	23	54.0%
Cle Elum, WA	2,731	23	54.0%
Easton, WA	312	23	54.0%
Roslyn, WA	622	23	54.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Delleker, CA	622	44	12.0%
Balaton, MN	622	32	36.0%
Ferrelview, MO	622	47	6.0%
Grand River, OH	622	34	32.0%
Maple Ridge, OH	622	46	8.0%
Roslyn, WA	622	23	54.0%

Source: The Roslyn, WA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.